My drive is currently very scruffy-looking tarmac - lots of potholes and it looks like somebody has spilled a load of concrete on it at some point.

I want to lay a gravel drive and have heard that putting gravel directly onto tarmac (after filling the potholes obviously) isn't a great idea. So my question is, how much of the old drive should I remove? E.g. is it ok to just dig down a few inches, then lay some scalpings and put the gravel on that? Or should I excavate to the full 200mm suggested in the "Driveway and Path Project"?

Best to start again with the 200mm+ depth of type 1 tampered down with a plate Compactor. Then throw a lean mix of sand & cement over the top. Then cover with gravel. Worth also running half round edging stones up the sides to help the base & gravel from moving.

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